Measured-service telephone system.



1. ERICKSON. v MEASURED SERVICE TELEPHONE SYSTEM.

' APPLICATION FILED-MAR. 29. I912. 1,217,426. Patented Feb. 27,1917.

5 SHEETS-SHEET. 1.

illlllllllllllllllllllllllllllllllllllllllllllllllllllilllllll 1.ERICKSON.

MEASURED SERVICE TELEPHONE SYSTEM.

- APPLICATION FILED MAR. 29,1912. 1,217,426. Patented Feb. 27,1917.

, 5 SHEETS-SHEET 2.

WIT/V5535? MW I w W? I J. ERICKSON.

MEASURED SERVICE TELEPHONE SYSTEM.-

APPLICATION FILED MAR. 29, I912.

- Patented Feb. 27,1917.

SSHEETS-SHEET 3.

J. ERICKSON.

MEASURED SERVICE TELEPHONE SYSTEM.

APPLICATION FILED MAR. 29. 1912.

Patented Feb. 27,1917.

5 SHEETS-SHEET 4.

J. ERICKSO'N.

MEASURED SERVICE TELEPHDNE SYSTEM.

APPLICATION FILED MAR. 29. 1912. 1,217,426. Patented Feb. 27,1917.

5 SHEETS-SHEET 5.

UNITED STATES PATENT OFFICE.

JOHN ERICKSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO AUTOMATIC ELECTRIC COM-PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

MEASURED-SERVICE TELEPHONE SYSTEM.

Specification of Letters Patent.

' Application filed March 29, 1912. Serial No. 687,102.

' movements in lVIeasured-Service Telephone Systems, of which thefollowing is-a specification. I Y

My invention relates to a measured service telephone system, and moreparticularly to a coin-collecting device for automatic telephonesystems, which coin-collecting device is particularly adapted for use ata public pay-station.

In automatic systems local calls are made automatically, while longdistance calls are usually made semi-automaticallythat is, through theintervention of an operator. It is therefore necessary that acoin-collecting device for use at a public pay-station in such a systembe arranged to operate automatically to require the calling subscriberto depositthe coin before conversation can be carried on over a localconnection. In the case of a long distance connection, however,thecharges are not the same for all calls, and it is therefore notsufficient to simply require that the calling subscriber deposit a coinbefore he can talk, but there must be provided some means whereby thecentral ofiice operator is notified of the denomination and number ofcoins deposited.

An object of my invention is, therefore, to devise a coincollectingdevice in, which these desired operations are accomplished, so that whena local automatic call is made a coin must be deposited before thetalking circuit is rendered operative, while when a long distanceconnection is made through the medium of an operator a signal istransmitted to such operator to indicate the denomination of the coindeposited by the subscriber. I

A further specific object of my invention is the provision of a buzzerwhich is operated over a line circuit which gives the signal to theoperator on the depositing of a C0111.

Other features of my invention are the general improvement of acoin-collecting device and its manner of operation and con-. nectionwith the telephone system.

These and other objects of my invention will be more readily understoodby reference to the accompanying drawings, in which I haveillustratedone specific embodiment of my invention in connection with an automaticsystem of the two-wire type employing line switches, selectors andconnectors, and in which provision is also made for eX- tending a longdistance call through the intervention of a manual cord circuit.

v In said drawings Figure 1 is a front view and Fig. 2 a side elevationof my improved toll apparatus Without its inclosing case.

Fig. 3 is a sectional view of the coin chute taken on the line 33 ofFig. 2.

Fig. 4 is a detail view showing more clearly the manner in which the camwheels cooperate with the controlling levers.

Fig. 5 is an enlarged side view of the lower part of Fig. 1, with thesprings 54 and 53 and the pinion 33 removed.

Figs. 6, 7 and 8 show a complete connection between a calling and acalled subscriber in an automatic telephone system, illustrating onemanner in which my invention may be employed.

Fig. 9 shows an operators cord circuit and manual telephone. 1

Figs. 10 to 14, inclusive, show a number of different circuitarrangements which are suitable for use in connection with thecoincollecting device.

In Figs. 1 and 2 there is shown a base plate 2 to the front of whichthere are secured three coin chutes 3, 4 and 5 which lead down into anysuitable coin box. Also secured to the front of the plate 2, butelectrically insulated therefrom and from each other, there is a groupof contact springs 6, 7 and 8. To the lower end of the spring 8 there isattached a swinging arm 9. Upon the back of the plate 2 there is mounteda polarized electromagnet comprising two coils 11 and 12, a permanentmagnet 13 and a pivoted armature 14. To the armature 14 there is secureda downwardly projecting arm 15, the lower end of which arm is bentforward so as to extend across and just above the arm 9. Upon the upperside of the arm 9 there is a small lug 16. When the armature 14 isattracted downward toward the coil 12, the lower end of the arm 15assumes a position behind the lug 16, as shown in Fig. 1. If the magnetnow be energized Patented Feb. 27, 1917. I

arm 15-will engage the lug 16 and cause the arm 9 to be carried bodilyto the left, thereby closing the contactsbetween the springs 6, 7 and 8.These springs will remain closed as long as the magnet remains energizedin this direction, or until the left-hand end of the arm 9 is tippeddownward so as to release the lug 16 from the arm 15.

Near the lower end of the base plate 2 there is a shaft 17 journaled insaid base plate and in the mounting plate 18. To the forward end of theshaft 17 there is secured a handle or lever 19, while around the rearend of said shaft there is coiled a driving spring 20. Loosely mountedupon the shaft 17 between the plates 2 and 18, but rigidly secured toeach other, there are four cam grgheels 21, 22, 23 and 24 and a gearwheel cam wheels 22, 23 and 24 is provided with two notchesdiametrically opposite each other. The notches of adjacent wheels areradially displaced from each other by approximately the length of anotch, as shown in Fig. 4, in which 26 and 27 are the notches in thewheel 22; 28 and '29 are "the notches in the wheel 23; and 30 and 31 arethe notches in the wheel 24. Upon the periphery of the cam wheel 21thereare six teeth divided into two groups of three each and locateddiametrically opposite each other. Upon the face of the wheel 21 thereis a pawl 32 adapted to cotiperate with two ratchet teeth in the shaft17in such a manher that as the handle 19 is rotated in a clockwisedirection it may rotate within the cam wheels without moving them. Therotation of the shaft in this direction, therefore, simply serves tostore up tension in the spring 20. When, however, the shaft 17 isrotated in a counter-clockwise direction by the spring 20, the teeth inthe shaft engage the pawl 32 and force the cam wheels to rotate with it.The gear wheel 25 meshes with a pinion 33 which is firmly secured to aworm wheel 34which meshes with a worm on a shaft 35 to which are securedtwo weighted governor springs 36. When the shaft 35 rotates, the ends ofthe springs 36 fly out and rub on the inside of a stationary cup 37,thereby providing a braking action to govern the speed of operation ofthe device.

Loosely mounted upon the pin 38 (Fig. 1) there are three bell cranklevers 39, 40 and 41. The horizontal arms of these levers arepawl-shaped and rest upon the upper side of the cam wheels 22, 23 and24, respectively, as shown in Figs. 4 and 5. The vertical arms of thelevers 39, 40 and 41 are provided with horizontal projections whichextend into the coin chutes 3, 4 and 5, respectively. (See Figs. 1 and3). When the horizontal arms of these levers are resting upon theperiphery of their respective cam (See the enlarged Fig. 5). Each of thewheels, the upper ends of said levers project far enough into therespective coin chutes to catch and hold a'deposited coin of thedenomination which that particular chute is designed to receive. When,however, a notch in one of the cam wheels is rotated under the end ofits lever it drops into said notch and permits the upper end of thelever to bdwithdrawn from the chute far enough to permit the freepassage of the coin. 1

Just above and to the right of the cam wheels there is a short thickblock-like lever 43 rotatably mounted upon the base plate 2. Looselymounted upon the block 43 by means of the screw 44 there is a lever 45,the lower end of which lever is provided with a projection 46 whichprojects into the path of the teeth on the cam wheel 21. To the upperend of the lever there isloosely secured an arm 47 provided at its endwith three fingers which project into the respective coin chutes 3, 4and 5. The spring 48 normally holds the lower end of the lever 45against the wheel 21. I The lever 43 is normally held in the positionshown in Fig.

1, with the projection 50 resting against the stop screw 51 by thespring 52. Likewise pivoted to the base plate 2 there is an arm thelower end of which projects into the path of the projection 50, whilethe upper end is adapted to engage the downwardlyextending end portionof the arm 9 when the upper end of this lever is swung to the right. Asthe cam wheel 21 revolves, the teeth thereon force the lever 45 outward.The spring 52 is stronger than the spring 48, so that if there is nocoin in any of the chutes to prevent the arm 47 from moving to the leftwhen the lower end of the lever 45 is forced outward, said lever simplyoscillates about the pivot screw 44 and the block 43 remains stationary.If, however, there is a coin in any one of the chutes when the lower endof the lever 45 is forced out- 1 ward, the arm 47 cannot move to theleft and consequently the lever vibrates about the right-hand end of thearm 47 as an axis and the screw 44 is forced to the right, causing theblock 43 to turn upon its pivot against the tension of the spring 52.When the block 43 is thus turned it separates the contact springs 53 and54 and rotates the lever 55 about its pivot point, causing the upperendof said lever to swing to the right so as to engage the down-turnedend of the arm 9 and tip it up so as to release the lug 16 from the arm15.

The manner of cotiperation between the cam wheels, levers, etc., is asfollows: If the the cam wheels 21, 22, 23 and 24 to rotate with saidshaft during its return movement. During this return of the cam wheelsthe following operations occur in regular order: First the lever 45 ismomentarily forced outward by a tooth on the wheel 21, then the end ofthe lever 39 drops into a notch in the wheel 22, thereby momentarilyopening the chute 3, then the lever 45 is again forced out by the nexttooth on the wheel 21, after which the end of the lever 40 drops into anotch in the wheel 23 to open the chute 4, then the lever 45 is oncemore operated by the third tooth in the wheel 21 and, finally, the lever41 is operated to open the chute'5.

, As has been explained, the operation of the lever 45 when there is acoin in any one of the coin chutes causes the block 43 to operate andopen the springs 53 and 54, while the operation of the lever 45 whenthere is no coin in anv of the chutes is without effect on the block 43.It will thus be seen that if a coin is deposited in the slot 3 and thelever 19 is operated, as above described, the springs 53 and 54 will beseparated once,

then the coin will be released'and the two following operations of thelever 45 will be ineffective to operate said springs. Likewise, if acoin is deposited in the slot 4, the springs will be separated twice,and a coin in the slot 5 will cause three separations of said springsduring the return of the lever 19.

The entire mechanism of the coin-collecting device, with the exceptionof the lever 19 and the stop pin 75, may be inclosed in suitable case orbox. The automatic tele phone system represented in Figs. 6, 7 and 8 isthe well-known type of system employing subscribers individual or lineswitches, first selectors, second selectors and connectors, theconnection shown being established between a calling substation A and acalled substation A through the medium of a line switch C, a firstselector E, a second selector F and a connector H. As shown herein, thesubstation A comprises the usual receiver 56, transmitter 57 switch hook58, ringer 59 and condenser 60. Being an automatic substation it is alsoprovided with an automatic calling device. This calling device may be ofthe type shown 1n British patent to S. G.

' S. Dicker No. 29,654 of 1910. In Fig. 6,

however, the calling device is represented diagrammatically by a pair ofimpulse springs 61 and 62 and a toothed impulse wheel 63 which iscontrolled by the subscriber through the medium of a dial (not shown)provided with finger holes. The mechanism is so arranged that as thedial and impulse wheel are rotated forward by the subscriber, theimpulse springs are not operated; but as the dial returns to normalposition, said springs are separated momentarily a number of timescorresponding to tively. The by the private magnet 107 in the usualman-- the digit called. The substation A is also is shunted by theresistance 65. The springs 53 and 54 of the calling device form ashortcircuit around. the coil 66 vof a buzzer which is included seriallyin one side of the line. The coil of ,the buzzer comprises two windingsconnected differentially, one of said windings, however, beingshort-circuited through the springs 67 and- 68 when said coil isdeenergized.

The line switch C and the master switch D are of the general type ofline and master switches disclosed in British patent to R. W. James No.26,301 of 1906, but of the particular form shown in British patent to T.G. Martin No. 1,419 of 1910.

The selector E is of the general type .of selector switch shownin'United States Letters Patent No. 815,321, granted March 13, 1906, toKeith, Erickson and Erickson, the circuits being modified, however, asshown in British Patent No. 1,419 of 1910, referred to above, in orderto operate in a system in which the central office apparatus iscontrolled by the calling subscriber over the two sides of the line inseries.

The selector F is similar to the selector E,

The connector H is of the general typeof connector switches disclosed inUnited States Letters Patent No. 815,176, granted March 13, 1906, toKeith, Erickson and Erickson, 'but, like the selectors, is modified tooperate in a two-wire system. Like the selectors, the connector isprovided with a shaft (not shown) carrying the wipers 102, 10 3 and 104and controlled by the vertical and rotary magnets 105 and 106,respecusual sideswitch is controlled ner. The line relay108 is connectedwith the line through the springs of a reversing relay 109. At B thereis shown a ringing current generator and at S a busy signaling machineis represented.

The substation A and the line switch C are identical with the.substation A and the line switch 0 shown in Fig. 6. The operators cord 0and themanual substation A (Fig. 9) may be of any suitable or approvedgrounded at Gare represented. There need,

however, be but one such battery, or, preferably, but one battery ineach exchange, if there are more than one exchange.

Having given a general description of the apparatus, it will now beexplained in detail how the subscriber at substation A may obtainconnection with either an automatic line or a manual line, and how thecoin-collecting device may be operated to collect the proper toll forthe different kinds of calls. It will first be explained how thesubstation A is connected with the automatic substation A. When thereceiver at the calling substation A is removed from the switch hookpreparatory to making a call, the talking circuit is bridged across theline, whereby a circuit is closed from ground G through the springs 110and 111, line 112, coils 12 and 11, transmitter 57, receiver 56, springs61 and 62, hook switch springs 113 and 114:, springs 53 and 54, line115, springs 116 and 117 and the line winding 74 of the switch C to thebattery lead 120, thence to the battery B and to ground G. The currentthrough the coils 12 and 11 of the coin-collecting device is at thistime in the proper direction to attractthe armature toward the coil 12to carry the arm 15 behind the lug 16 on the arm 9. The winding 74 ofthe switch C, upon energizing, closes the circuit of the operatingwinding 72, which causes said switch to operate to extend the lineconnection through the bank springs 7 8 and 7 9 and 80 and 81 to a firstselector E, whereupon its line relay 98 becomes energized by reason ofthe closed bridge across the line at the substation. The relay 98, uponenergizing,

closes the circuit of the relay 99. The closure of the springs 121 ofthe relay 99 completes a. circuit for the holding winding 73 of the lineswitch C and extends a guarding potential from the ground G back throughthe switch C and over'the conductor 123 to the connector private bankcontacts of the calling line. \Vhen the calling subscriber operateshiscalling device for the first digit of the number of the calledsubstation, which will be assumed to be 2220, the circuit of theselector line relay 98 is broken twice momentarily by the separation ofthe impulse springs 61 and 62 at the substation. The relay 99, and otherrelays similarly represented throughout the drawings, are slowactingthat is, slow to deenergize, so that they remain energized duringthe momentary interruptions of their circuits. Each time the line relay98 is deenergized in response to the impulses from the substation, acircuit is closed through the vertical magnet 89. Since the digit calledis 2, the ver- Lamaze tical magnet 89 receives two impulses over thiscircuit and operates to raise the switch shaft and Wipers two steps,after which the side switch passes to second position.- The rotarymagnet 90 then operates in the usual manner to rotate the wipers onto anidle trunk line, afterwhich the side switch passes to third position,whereby the line connection is extended through the-side switch wipers91 and 92 and shaft wipers 86 and 87 to the conductors 128 and 129leading to the second selector F. Theline relay 130 of the selector Fthereupon becomes energized in the same manner in which the relay 98 ofthe selector E was energized when connection was first extended to it.

When the substation calling device is operated for the second digit 2 ofthe called number, the second selector F operates in the same manner asexplained for the selector E in connection with the first digit, toextend the connection over the trunk conductors 137 and 138 to an idleconnector H. The line relay 108 of the connector thereupon becomesenergized over the line circuit and closes an energizing circuit,

through the relay 139.

When the substation calling device is operated for the third digit 2,the line relay 108 of the connector is deenergized twice momentarily.Since the relay 139 is slow acting, the deenergizations of the relay108transmit two impulses over the circuit extending from ground G through.the spring 1 16 and its back contact, spring 147 and its front contact,relay 1 18, vertical magnet and the side switch wiper 14:9 to thebattery lead 120. Since the digit called is 2, the vertical magnet 105receives two impulses over this circuit and operates to raise the wipersof the switch two steps to a position opposite the second level of bankcontacts. The relay 148, which is included in the circuit of thevertical magnet, is energized by the first impulse and, being slowacting, remains energized until after the last impulse is delivered. Tnits energized position the relay 148 completes a circuit extending fromground G through the private magnet 107 to the battery lead 120. Theprivate magnet 107, upon deenergizing when its circuit is broken by therelay 148 after the last impulse is delivered to the vertical magnet,permits the side switch to pass from first to second position. Thecalling subscriber now operates his calling device for the last digit 0,thereby causing the line relay 108 to deenergize ten times, each timeclosing a circuit extending from ground G through the spring 146 and itsback contact, spring 147 and its front contact, relay 148, springs 152and 153, rotary magnet 106 and the side switch wiper 149 (in secondposition) to the battery lead 120. The rotary magnet operered over thiscircuit to rotate the wipers engagement of the side switch wiper 154with its third-position contact point finally complete the connectionthrough the wipers 102 and 103 with the called line. The side switchwiper 155, when in third position, completes an energizing circuit forthe cut-off winding 156 of the switch C v and extends a guardingpotential to the coniiector private bank contacts of the called Thewinding 156, upon energizing, attracts the armature 157, which operatesto disconnect the switch C from the called line and to close the contact158 in the talking circuit. The engagement of the side switch wiper 149of the connector with its third-position contact point completes acircult extending from ground G through the interrupter 159, ringingrelay 160, springs 161 and 162 and the side switch wiper 149 to thebattery lead 120. The ringing relay 160, upon energizing, operates todisconnect the calling line from the called line and to sig-' nal thecalled subscriber. Since the circuit of the ringing relay 150 includesthe interrupter 159, said relay is energized only in termittently so asnot to ring the called subscriber continuously. It will be seen that thecurrent which flows through the windings 12 and 11 of thecoin-collecting device at the calling substation in series with thewindings of the line relay 108 of the connector after the connection isextended thereto is in thesamedirection as the original current whichflows through said windings in series with the line relay. of the switchC when the receiver is first removed from the switch hook. Therefore,during the entireoperation of setting up the connection the armature 14remains attracted toward the coil 12. \Vhen the calling subscriber re--moves his receiver in response to the call, or assoon thereafter as theringing relay 160 denergizes, if it happens to be energized at the time,the called substantion is provided with talking current over a circuitextending from ground Gr at the connector through the side switch wiper155, lower winding of the relay 165, ringing relay springs 167 and 166,side switch Wiper 154, shaft wiper 103, thence to and through thesubstation A and back over the other side of the line through the shaftwiper 102, springs 168 and 169, springs 17 0, upper winding of the relay165 and the side switch wiper 149 to the battery Thedener g1zat1on ofthe private magnet and the lead 120. The relay 165 is energized by thistalking current and closes a circuit extending from ground Gr throughthe side switch wiper 155, relay 109 and the springs 171 to the batterylead 120. The relay 109, upon energizing, opens the circuit of theringing relay 160 and closes a locking circuit for itself to battery byway of the springs 172 and 162 and the side switch wiper 149. Theshifting of the springs 173 and 174 upon the energization of the relay109 transposes the connections between the windings of the relay 108 andthe trunk conductors 137 and 138, thereby reversing the direction ofcurrent flowing in the callingline. This reversal of the current in thecalling line causes the armature 14 of the coin-collecting device to beattracted downward toward the coil 11, and, since the arm 15 is behindthe lug 16, this operation of the armature 14 closes the contact betweenthe springs 6, 7 and 8, thereby short-circuiting the trans mitter 57 andshuntingthe receiver 56 by the resistance 65. This short-circuiting ofthe receiver and transmitter renders the calling substantion inoperativefor talking, but the calling subscriber can hear the called subscriberanswer owing to the fact that the receiver is not completelyshort-circuited, but is only shunted by the resistance 65. In order toconverse with the called substation the calling subscriber must causethe springs 6, 7 and 8 to be separated, and this can be done only bydepositing a coin in the coincollecting device. The charge for automaticcalls is preferably that corresponding to the coin of the smallestdenomination for which any of the coin chutes are intended. As has beenexplained, when a coin is deposited in any of the chutes and the-lever19 is pulled down and permitted to return to normal position, thesprings 54 and 53 are opened at least once and the lever'55 raises theend of the lever 9 momentarily one or more times. The separation of thesprings 54 and 53 at this time is without any particular function.

The tipping up of the lever 9, however, re-

leases said lever from'the arm 15 and permits the springs 6, 7 and 8 toreturn to their normal disengaged positions, whereby the callingsubstation is rendered operative and the calling and called subscribersmay carry on an uninterrupted conversation overthe calling circuitrepresented by the heavy lines in Figs. 6, 7 and 8.

Upon the completion of the conversation the entire connection isautomatically released by the hanging up of the receiver at the callingsubstation. During the time the conversation is being carried on thecircuits of the release magnets of the switches H, F and 'E are heldopen by the *ifelays 139, 131 and 99, which are energized over a circuitextending from ground G at the connector through the spring 146 of theline relay 108 the battery lead 120.

and its front contact and thence through the relays 139, 131 and 99 inmultiple to The hanging up of the receiver at the substation Apermanently breaks the circuit of the connector line relay 108. Therelay 108, upon deenergizing, opens the holding circuits of the releasere- ,lays 139, 131 and 199 of the switches H, F and E, respectivelyThese relays, upon denergizing, closethe circuits of their respectiverelease magnets 175, 177 and 196, which, upon energizing, immediatelyrestore the shafts and side switches of their respective switches tonormal position. The switch shafts, upon reaching their lowestpositions, separate their respective ofi-normal springs to permit therelease magnets to denergize. The denergization of the relay 99 of theselector E also opens the holding circuit of the holding winding-7 3 ofthe line switch G and permits its plunger to be restored to normalposition, thereby leaving all of the apparatus employed in theconnection in its normal position.

It having been explained how the subscriber at substation A may obtainconnection with an automatic substation, and how the coin collectingdevice requires the calling subscriber to deposit a coin before he cancarry on a conversation, it will now be explained how the subscriber atan automatic substation A may obtain connection with a manual substationA through the medium of an operators cord circuit 0, and how .theoperator may require-the calling subscriber to deposit coins ofdifi'erent denominations for calls for which different rates arecharged, and how, through the medium of the coin-collecting device, the

operator is notified whether or not the calling subscriber has depositedthe proper coin or coins. In the system shown herein it is I assumedthat to a certain level of the banks of the first selectors E there areconnected trunk lines which terminate in jacks J (Fig. 9) on a manualswitchboard. When the calling subscriber wishes to call the manualsubscriber A he removes his receiver and operates his calling device forthe digit corresponding to the first selector bank level to which themanual trunk lines are connected. The first selector E operates inthemanner alread described to connect the calling line with t e trunkconductors 178 and 179 leading to thejack J. A circuit is thereuponclosed from ground Gr through the lefthand winding of therelay 181,contact 182, trunk conductor 179, thence to and through the substation Aand back over the other side of the line through the trunk conducto'r 178, contact 183 and theright-hand winding of the relay 181 to the batterylead. The relay 181, upon energizing, closes the circu'it of the linelamp 184 and completes a holding circuit for the release relay 99 ofnarrates the selector E. The circuit of the relay contact 185, conductor180, private wiper 187 and thence to and through the relay 99- Theoperator, upon seeing the signal of the lamp 184, inserts the. plug Pinto the jack J, whereupon the line is connected with the cord 0 and acircuit is closed from ground G through the relay 187, sleeve conductorsof the plug P and the jack J and cut-ofi relay 188 to the battery B. There lay 188, upon energizing, cuts off the line relay 181 and connectsthe ground G with the release relay 99 of the selector E to maintainsaid relay energized after ground G is cut ofi by the deenergization ofthe line relay 181. After the line relay 181 is disconnected from theline, the calling substation is provided with talking current throughthe supervisory relay 190' of the cord circuit. The operator nowoperates the key K to connect her talking set T with the cord to inquireof the calling subscriber the station desired. The operator completesthe connection with the line called for by inserting the plug P into thejack J and operating the ringing key K to signal the i called subscriberin the usual manner. After the called subscriber has answered, theoperator again operates the key K to connect her talking set with theline and requests the calling subscriber to deposit a coin of the properdenomination in the coin-collecting devicej As has been explained, if acoin is deposited in the slot 3 (Fig. 3) and the lever 19 is pulleddown, the springs 53 and 54 will be separated once. If a coin isdeposited in the slot 4, the said springs will be opened twice, and ifthe coin is deposited in the slot 5, the springs will be separated threetimes. Referring to Fig. 6, it will be seen that when the springs 53 and54 are separated, the short-circuit is removed from the buzzer coil 66,and since one winding of the coil is normally short-circuited throughthe springs 67 and 68, said coil will be energized; but as soon as thesprings 67 and 68 are separated by theattraction of the armature of thecoil, the short-circuit is removed from the upper winding and, since thecoil is differentially wound, the current in the upper coil equalizesthe current in the lower coil and the armature drops back to againpermit the springs 67 and 68 to close. It will therefore be seen that aslong as the springs 53 and 54 are open, the coil 66 will operate as abuzzer, but during its operation it does not'open the line circuit so asto interfere with the energization of any relays which are energizedover the line. The operations of the buzzer'produce a buzzing sound inthe operators receiver. Therefore, if the operator hears one buzz afterrequesting the calling subscriber to deposit the coin, she knows thecoin has been l quested to deposit. After the conversation is completedtheoperator is given the usual disconnect signal by the hanging up. ofthe receiver at the calling and called substations,

' and she thereupon removes the plugs P and P in the usual manner. Theremoval of the plug P from the jack J permitsv the cut-ofi relay 188 todeenergize, which disconnects ground Gr from the release relay 99 of theselector E, which denergizes and causes the automatic part of theconnection "to be released in a manner which has already been described.

As shown in Fig. 6, the circuit arrangement is such that when thesprings 6, 7 and 8 are brought into contact by the operation of thepolarized magnet of the coin-collecting device, the transmitter iscompletely short-circuited, but the receiver is simply shunted by theresistance 65. This arrangement is very simple, but is not entirelywithout objection owing to the fact that it does.

not entirely preclude the possibility of the calling subscriber talkingthrough his receiver. In Figs. 10, 11, 12 and 13 there are shown anumber of arrangements by which this objection may be removed. The receiver shown herein is assumed to be of the series typethat is, areceiver without a permanent magnet and which is dependent. for.1tsenergization upon current received over the line. from the centralofiice battery. Such a receiver, when not energized by direct current,is susceptible to a certain ex.- tent to alternating voice currents andwill operate as a receiver, but will 'not act as a transmitter totransmit voice-currents in response to words spoken into it. This factis made use of in the arrangements shown in Figs. 10, 11, 12 and 13, inwhich the circuit connections are such that when thecurrent is reversedin the calling line by the response of the called subscriber, thereceiver of the calling line is placed in such relation to the line thatit may receive voice-currents, but cannot receive anybattery currentfrom the line. The calling telephone is thereby rendered entirelyinoperative for talking, but is left operative for hearing the calledsubscriber. The same reference numerals, as far as possible, have beenused in Figs. 10, 11, 12 and 13 as are used in Fig. 6.

"In Fig. 10 the normal circuit through the substation extends from theline 112 through the coils 12 and 11, springs 7 and 8, receiver 56' andtransmitter 57 to the line 115. When the'current in the line is reversedupon the response ofthe called subscriber, the spring 8 and intoengagement with the spring 6, whereby the circuit for direct currentthrough the receiver and transmitter is broken and the coils 12 and 11are bridged 7 is shifted out of contact with the spring across the linesthrough the resistance 65.

Although the circuit through the receiver is broken so far as directcurrent is concerned, it still remains intact for voice currents whichflow through the condenser 205.

In Fig. 11 the arrangement is the same as in Fig. 10 except that theresistance 65 is replaced by a short-circuiting buzzer 65". This buzzerbegins to operate as soon as it is bridged across-the line through thecoils 11 and 12 and notifies the calling subscriber thatthe calledsubscriber has removed his receiver without the necessity of waiting fora verbal response. In addition to the buzz caused directlyv by thevibrations of the armature of the buzzer, fluctuations of current arealso set up through the receiver, which produce a buzzing sound therein.

In Fig. 12 the two windings of an induc- 0 tion coil are connectedserially in the line. When the polarized magnet of the coin-collectingdevice is operated to close the contact between the springs 6 and 7, alldirect current is shunted from the receiver and transmitter and they areincluded in a local circuit which is inductively connected with the linecircuit through the two windings of the induction coil. 1 1

The arrangement in Fig. 13 is the same as that in Fig. 12 with theaddition of two springs 6 and 7 which normally short-circuit theinduction coil 206.

It is sometimes desirable to have the springs which render the callingtelephone inoperative when the called subscriber an swers situated inthe telephone itself instead of in the coin-collecting box. This may bedone, as shown in Fig. 14, by placing the telephone-shunting springswhich correspond tothe springs 6, 7 and 8 in Fig.- 6 under the controlof an auxiliary relay 207. This relay is inserted in the line circuit,but is normally short-circuited by the springs 6 and 7.- .When thecalled subscriber answers, the magnet in the coin-collecting boxoperates to separate the springs 6 and 7 to remove the short-circuitfrom the relay 207.

The relay 207, upon energizing, operates toshunt the telephone.Although, as shown, the relay 207 shunts the telephone in the samemanner in which this is done by the springs 6, 7 and 8 in Fig; 6, any ofthe arrangements shown in Figs. 10, 11, 12 and 13 might be used inconnection with the relay- 20 i It will thus be seen that I have deviseda very eflicient pay-station device in which the calling telephone isrendered inoperauv'e until after a coin has been deposited in thecoin-collecting device, and in which a signal is transmitted over theline circuit to the central operator when such is employed in extendinga connection to indicate to such operator the character and denominationof the coin deposited.

While I have illustrated one particular embodiment of my invention, itis to be uning current to the line.

2. In a telephone system, a subscribers line extending to the centraloflice, a coincollecting device on said line, a buzzer, a circuitincluding said line for operating said buzzer to indicate thedenomination of a coin deposited in said device; and means {orestablishing a talking circuit over said 3. In a telephone system, aplurality of subscribers line-s, means including an operators cordcircuit for extending a connection between two of said lines, acoin-collecting device on one of said subscribers lines, a signal, meansfor operatingsaid signal over a line circuit in order to indicate to theoperator the denomination of the coin deposited in said coin-collectingdevice, and

common battery means for supplying talking current to the line.

4. In a telephone system, a subscribers line, means including anoperators cord circuit for extending a connection from said subscribersline to a. second subscribers line, a coin-collecting device on saidfirst-mentioned line, a signal for indicating to the operator thedenomination of the coin deposited in said coin-collecting device, aline circuit for controlling the operation of said signal and commonbattery means for supplying talking current ;to the line.

5. In a telephone system, a coin-collecting device having a plurality ofcoin chutes,

a plurality of levers for closing said coin chutes, a pair of contactsprings, means for operating said contact springs a certain number oftimes whena coinis deposited in-one of the chutes, and for then openinthe chutes to allow the coin to be collected? and a signal controlled bythe operation of said contact springs.

6. In a telephone system, a subscribers line, a coin-collecting deviceon said line, a. plurality of coin chutes for said coin-collectingdevice, a plurality of levers, one for each coin chute, for closing thecorresponding chute, a. pair of contact springs,means for operating saidcontact sprin s a certain number of times when a coin it eposited in oneof said chutes, means for then opening the chutes to allow the coin tobe collected, and means controlled by said contact springs fortransmitting a signal over said subscribers line.

7. In a telephone system, a. subscribers line, a coin-collecting deviceon said line, a plurality of coin chutes for said coin-collectingdevice, a plurality of levers, one for each coin chute, for closing thecorresponding chute, a pair of contact springs, means for operating saidcontact springs a certain number of timeswhen a coin is deposited in oneof said chutes, the operation of said contact springs being varied inaccordance with the chute in which the coin is deposited, means for thenopening the chutes to allow the coin to be collected, and meanscontrolled by said contact springs for trans mitting a signal over saidsubscribers line.

8. Ina telephone system, a subscribers line, a coin-collecting device onsaid line having a plurality of coin chutes, a plurality of leversforclosing said chutes, a pair of contact springs, a plurality of camwheels and levers associated therewith for operating said contactsprings a certain number of times when a coin is deposited in one of thechutes, and to then open the chutes to allow the coin to be collected,and a signal transmitted over the line circuit controlled by theoperation of said contact springs.

9. In a telephone system, a plurality of subscribers lines,semi-automatic and auto- 1" matic means for establishing a connectionbetween two of said lines, a coin-collecting device, means forautomatically requiring a coin to be deposited before conversation canbe carried on over an' automatic connection,

and means for notifying an operator of the denomination of the coindeposited in a semi-automatic connection.

10. In atelephone system, a plurality of subscribers lines, automaticswitches for establishing automatic connection between one of saidsubscribers lines and a second line, a coin-collecting device on one ofsaid lines, means for rendering said connection inoperative for talkingpurposes until after a coin has been deposited in said coin-collectingdevice, an operators cord circuit, means including said operators cordfor establishing a connection between said first-1nentioned line and athird line, a signal for indicating to the operator the denomination ofthe coin depositedin said coin-collecting device.

and acircuit including a subscribers line for operating said signal.

11.. In a telephone system, a plurality of subscribers lines, automaticswitches for extending a connection between two of said lines, acoin-collecting device on the calling line, means operative upon theresponse of the called-subscriber for rendering the talking circuitinoperative, and a lever for said coin-collecting device adapted to berotated by the calling subscriber after a coin has been deposited torestore the talking circuit to operative condition.

12. In a telephone system. a plurality of subscribers lines, automaticswitches for extending a connection between two of said lines. acoin-collecting device on the calling line, means operative upon theresponse of the called subscriber for rendering the talking circuitinoperative, and a lever for said coin-collecting device adapted to beoperated by the calling subscriber after a coin has been deposited torestore the talking circuit to operative condition.

13. In a telephone system, a subscribers line. a coin-collecting deviceon said line, a plurality of coin chutes, and a difl'erentially-woundbuzzer adapted to transmit a signal over said line to indicate the chutein which a coin is deposited.

14:. In a telephone system, a subscribefis line. a coin-collectingdevice. on said line having a plurality of coin chutes. a plurality ofcoin vheels, one corresporuling to each chute.means for operating saidwheels,

.a pair of contact springs contgi' olled by said coin wheels and adaptedto beggoperated one or more times. dependent uponthe chute in which acoin is deposited, and; asignal controlled by said contact springs.

15. In, a telephone system. a subscribers line. a coin-collecting deviceon said line having a plurality of coin chutes, a diflerentially-woundbuzzer, and means for operating said buzzer one or more times when acoin is deposited in one of said chutes to indicate the chute employed.

16. In a telephone system, a subscribers line, a coin-collecting device,a signal, a pair of normally closed contact springs for short-circuitingsaid signal, and means for separating said springs to operate saidsignal when a coin is deposited in said coincollecting device toindicate the value of the coin.

17. In a telephone system, a plurality of subscribers lines, automaticselecting switches and an operators cord circuit for extending aconnection between two of said lines, a coin-controlled device on one ofsaid subscribers lines, and a signal for indicating to the operator thedenomination of a coin deposited .in said device.

18. In a telephone system, a plurality of subscribers lines, automaticselecting switches and an operators cord circuit for extending aconnection between two of said lines, a coin-controlled device on one ofsaid lines. a buzzer, and a circuit for operating said buzzer so as toindicate to the operator the denomination of the coin deposited in saidcoin-controlled device.

19. In av telephone system, a plurality calling subscriber after a coinof subscribers lines, automatic selecting switches and a cord circuitfor extending a connection between two of said lines, a coin-collectingdevice on one of said lines having a plurality of coin chutes, and adifferentially-wound buzzer adapted to transmit a signal over said lineto indicate the chute in which a coin is deposited.

20. In a telephone system, a plurality of subscribers lines, meansincluding an automatic switch and an operators cord circuit device,means for automatically requiring a coin to be deposited beforeconversation can be carried on over an automatic connection, and meansfor notifying an operator of the denomination of the coin deposited in asemi-automatic connection and for collecting said toll.

22. In a telephone system, a plurality of subscribers" lines, automaticswitches for establishing automatic connection between one of saidsubscribers lines and a second line, a coin-collecting device on one ofsaid lines, means for rendering said connection inoperative for talkingpurposes until after a coin has been deposited in said coin-collectingdevice, an'operators cord circuit, means including said operators cordfor establishing a connection between said first-mentioned line andathird line, a signal for'indicating to the operator the denomination ofthe coin deposited in said coin-collecting device, and a circuitincluding a subscribers line for operating said signal and forcollecting said toll.

23. In a telephone system, a plurality of subscribers lines, automaticprogressively movable switches for extending a connection between two ofsaid lines, a coin-collecting device on the calling line, meansoperative upon the response of the called subscriber for rendering thetalking circuit inoperative, and a lever for said coin-collecting deviceadapted to be rotated by the has been deposited to restore the talkingcircuit to operitltive condition and for collecting said to 24. In atelephone system, a plurality of subscribers lines, automaticprogressively movable switches for extending a connection between two ofsaid lines, a coin-collecting device on the calling line, meansoperative upon the response of the called subscriber for rendering thetalking circuit inoperative, and [a lever for said coin-collectingdevice adapted to be operated by the calling subscriber after a coin hasbeen deposited to restore the talking circuit "to opfirative conditionand for collecting said to Signed by me at Chicago, Cook county,Illinois, this 25th day of March, 1912.

JOHN EmoKsoN.

l/Vitnesses ARTHUR J. RAY, ALBERT ANDERSEN.

